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Comparison of kinetics of acetone, heptane and toluene photocatalytic mineralization over TiO2 microfibers and Quartzel® mats

Paper ID Volume ID Publish Year Pages File Format Full-Text
45436 46412 2015 10 PDF Available
Title
Comparison of kinetics of acetone, heptane and toluene photocatalytic mineralization over TiO2 microfibers and Quartzel® mats
Abstract

•Lab-extruded pure TiO2 microfibers are easily scalable at several tens of meters scale.•The kinetics of mats of Quarztel® or pure TiO2 fibers for VOCs mineralisation were compared.•A flow-though recirculating reactor with LEDs device was designed for loose photocatalytic mats.•Pure TiO2 fibers showed high performances for toluene mineralisation.

The kinetic parameters for VOCs (acetone, toluene, heptane) mineralization of lab-extruded pure TiO2 fibers prepared under easily scalable conditions were compared with those of a commercial photocatalytic media from Saint-Gobain, Quartzel®, under identical conditions. A flow-through recirculating reactor loop with variable LEDs irradiation at 365 nm was specially designed. All the experiments were carried out in a continuous recycle mode. Both types of fibers were very efficient for acetone and heptane mineralization. At 20% relative humidity (RH), the reaction rates were higher with the commercial media, whereas at 60% RH the catalysts displayed equal activity for acetone conversion. Toluene mineralization was much faster on these lab-made fibers than on Quarztel®, which was more sensitive to poisoning by reaction by-products. At 20% relative humidity, with the lab-made TiO2 fibers, typical quantum efficiencies were, respectively, 0.0106 and 0.0027 for acetone and heptane (100 ppmV initial concentration) and 0.0024 for toluene (200 ppmV initial concentration) while these quantum efficiencies were 0.0358, 0.0133 and 0.0011 with expanded Quartzel fibers under the same conditions. These results evidence a clear difference in the VOCs, water and polar by-products adsorption between these two kinds of fibers.These newly developed fibers can be produced at an industrial scale with a proven efficiency for VOCs degradation and mineralization. Since they are less sensitive to humidity than the commercial fibers, they could be most useful under actual ambient air conditions. These fibers present a good alternative to other commercially available photocatalytic media for gas phase purification.

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Keywords
Photocatalytic fibers; TiO2; VOC; Mineralization; Kinetics
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Comparison of kinetics of acetone, heptane and toluene photocatalytic mineralization over TiO2 microfibers and Quartzel® mats
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 179, December 2015, Pages 78–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us